
"I would immediately adjourn Monday's joint House/Senate meeting if any amendment motion was brought on for floor debate."
Chai urged the People's Alliance for Democracy (PAD) not to repeat its rally in October when they seized the Parliament.
His statement came as rumours spread that the joint session on Monday will be asked to consider the charter amendment proposal.
PAD have vowed to block any attempt to amend the charter, alleging that the government pushed for the amendment to pave the way for ex-PM Thaksin Shinawatra to return home.
PAD-led protest, which managed to seize the Parliament which was scheduled to consider the amendment on October 7, turned violent when police fired tear gas into the crowd, killing one and injured many others.
The session was merely scheduled for the deliberation of about 40 international agreements which Thailand concluded with foreign countries. Article 190 of the Constitution calls for parliamentary approval of all government-to-government agreements.
Senate Speaker Prasopsuk Boondej said he would consult with Chai to see whether the MPs might meet at a venue other than Parliament Monday or whether such a joint session should be considered an urgent issue or not.